Gas-engine.



PATENTED JULYgs, 1907.

E. FRANKLIN. GAS-ENGINE. APPLIOATION FILED Nov. za. 1905.

2 SHEETS-SHEET 1.

No.. 860,651. PATENTED JULY 2s, 1907.

E. FRANKLIN.

GAS ENGINE. Y APPLIGATION FILED NOV.28, 1905.

2 SHEETS-SHEET 2.

UNITED STATES PATENTl OFFICE.

ERNEST FRANKLIN, PORTLAND, OREGON.Y

GAS-ENGINE Application ilet November and useful Improvements in Gas-Engines, of which the following is a specification.

.This invention relates to gas engines, andhasy vfor its.

objects to produce a comparatively simple, inexpensi ve device of this character in which the piston will be positively driven during both its in and outretrokq` one wherein the movement oi the piston inlone direction serves to compress an# explosivelcharge for 'driving the piston in the other direction, and one wherein the explosive 'gas or iiuid vwill'be alternately drawn intov lthe separate compartments 4or chambers.

A further object of the invention is to provide an engine ofl this Vtype comprising a' pair ofrpistonsf connected for simultaneous movement, 4vone wherein aA charge of explosive fluid is admitted4 behind'the piston on its out-stroke for compression on its in-stroke, and one wherein the movement of one piston to compressing POSOII AOperatesl a valve` for admitting a charge.

to the the'rpiston.

With these and other objects in view, the invention comprises tlenovel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings: Figure l is'v acentral longitudinal section through an engine embodying the invention. I Fig. 2 is a transverse section taken on the line 2-2 of Fig. l. Fig. 3 is a similar view taken on the line 34? of Fig. l. -J'

Referring to the drawings, l designates a tubular casing subdivided by a central web or partitionZ into a pair oi compression compartments 3 and inclosing an inner tubular member 4 in turn divided by a central partition 5 into a pair ot' cylinders G, hereinafter termed respectively the front and rear cylinders, the casing l being closed by end members or heads 7 provided respectively with tubular extensions 8, 9,*of which the former is closed at its outercnd While the outer end of the latter is open and provided witlropposed bearings l0 in which is journaled the main drive shaft ll" having an eccentric or crankportion l2. Slidably disposed on the member 4 and at opposite sides of thc partition 2 is a pair of tubular piston members 13, 14, having heads l5 designed to fit in the cham-` bers 6 and provided with marginal webs or flanges 16 fitted in the casing l to work in the compartments 3, the piston members being connected for simultaneous movement by means oi connecting rods or elements 17 wtended through and slidably disposed in suitable bearing openings 18 formed in the partition 2, there being formed in each of the members .i3 or 14 and aroundthe adjacent head or piston proper l5 a passage 19 terminating at its outer end i'n a laterally-opening port 20 designed to register with an exhaust opening Specification of Letters Patent.

28,1905.` seran No. 289,464.

Patented Jury 23;' 19071 y or port 2l formed throughl the wall of thc adjacent cxtension 8 or 9, while-formed at the outer cnds ol thc comartments 3 are o eninvs or oris=22 leading io the ox? ternal atmosphere and through the medium of which air pressure within thecompartments i--i relieved,4 as

y'and `.for a purposehercinaftcr explained.

Formedin. the walls of the piston members A13, AliJ and at points adjacent they inncr 'cnds ol' the latter are lateral openings or ports 2 3lcading from the compariments 3 andadapted to register wit h ports or passages 24 formed in the partition 5 and communica'liug' respectively With the cylinders(Lsaid'pnssagcs boing icrmi- Hated at their inncr ends in valve souls 25 designed to ro ceive puppet valves 2G having sftcms 2? cx icndod in rclatively reverse directions thnmgh suit a l le homiiig oponings in the partition 5 and projected respect ircl y into the opposite cylinders 6,there being provided on tho outer Y.

end of each stein a hcad or but ton f S bol\\'ccn;which aud the partition 5 is arranged a noigniall y cxpandcd spring 29 acting to. maintainthc valve in closed position. it beingnoted in this connection that the arrangement-oi .the valve stemsjis such that the piston-l5 working in cylinder, as and for a purpose more. fully hcrcimiilcl explained. v .A

Leadinnr to the casinnr l is a "as su )lv )i ie or duct 30 a n o 'l l one cylinder 6 will opcn the valve leading lo tho other.

havinU a air of branch )orlions 3l communicating respectivdly with the compartments 3 through the medium of openings or ports 32, there boing arranged in the branches 3l inwardly opening check valves 33 dcsigned to normally close communication bctwccn thc pipe 30 and casing and to open as usual undcr the action of suction created in the compartments 3 and against the action of springs 34 for admitting the explosive ilu id to said compartments. I i

Pivotally connected with the piston member lll by means oi a pin35 is a connecting rod ,36 cxtcnded ccn- Zrally through the extension 9 and having its other cud journaled on tlie crank portion l2 of shalt ll for operating the latter during the operation of the pistons 13, lli, as usual in devices ol thisclass.

In practice, upon each stroke of the connecting rod 36. a charge is compressed in one of the cylinders 6 and a fresh chargeadmitted to the other cylinder for compression upon reverse movement of the pistons, while at the same time a chargev of gas is drawn into one of the compartments 3 for compression therein and final admittance to the first named cylinder. ,For instance, upon instroke of the connecting rod 3G, as shown in Fig. 1, a chargf` of gas is-com-prcsscd in thc forward cylinder 6 and the dead gases and other products of explosion are at .the same time exhaust cd from the rear cylinder' 6 through the passage 19 and ports 20 and 2l while. 'at the same time the val vc 2G which controls communication between the rearcylindcr and forward compartment 3 is opened at the completion of the instroke of the connecting rod to permit a. fresh charge ofgas which during rearward movement ofthe pistons has been compressed in the forward compartment to be admitted to the rea-r cylinder. Upon outstrokc oi the connecting rod under thev impulse o f explosion of the previouslyl compressed chargev within the forward.

cylinder 6, the charge of gas IWithin the rear cylinder is compressed and at. the completion of the forward movement of the pistons the other valve 26 controlling communication between the forward cylinder Gand rear compartment 3 is opened to permit a i'resh charge o gas which has been compressed in the rear compartment to ow inte the forward cylinder' from which latter' the products of explosion are previously exhausted through the passage 19 and ports 20 and 2l, as before explained. Upon movement of the pistons on the instroke oi the connecting rod, a charge of gas is taken into the rear compartment from the duct 30 for com` pression through the reverse stroke of the pistons and to be finally delivered into the forward cylinder, while 'on the outstroko of the connecting rod a charge oi gas is taken from the duct 30 into the forward compartment and compressed therein and finally delivered into the rear cylinder on the instroke o the rod.

l It is to be understood that at the completion of each sti-oke of thc `connecting rod a charge is exploded in one of thef cylinders for driving the rod through iis reverse or return stroke whereby the rod is positively driven throughout each stroke and further that the porfis 22 serve to relieve air pressure in the chambers 3 behind ihe compression pistons or flangesl 16. I

Having thus fully described my invention, what I' claim is:

1. In an explosive engine, a casing containing an inner tubular member -and havingr a transverse 'partition dividing the space outside Avof said member into front and rear compression compartments provided with inlet ports, awallll or partition disposed in said member and direlief viding the same into front and rear cylinders. said wall being provided with passages arranged to connectthe 40 ably disposed on said tubular member' and containing 45 heads designed for entrance into the adjacent cylinders, a

valve-controlled supply duct. communicating with lthe inlet. ports tor admitting a motive fluid to the compartments,

exhaust ports leading from the cylinders. a drive shaft journaled at one end of the easing. a pitman connection he 50 tween said shaft and the adjacent piston member. and means connecting the piston members for simultaneous movement.

2. In an explosive engine. a casing-eontaininz an inner,

tubular memherand having,r a transverse partition `dividprovided with passages arranged to connect the front and 6()` rear compartments for communication respectively with the rear and front cylinders. spring pressed valves arranged for normally closing said passages and having stems projected through the vwall respectively into the opposite cylinders. a valve-controlled supply duct communi- 675 eatingr with the inlet port for admitting `motive iluid to the compartments. tubular 'piston members slidahly disposed on the inner member andhaving heads designed for entrance into the adjacent cylinders` said piston members bein;r provided with external..marginal flanges disposed the casing.` leading from the respective cylinders. a drive shaft journaled at one end of the casing and a pitman connection between the shaft andadjacent pisionmember.

In testimony whereof, l affix my signature in presence of two witnesses. Y

ERNEST FRANKLIN.

Witnesses:

Jaures Conn, lhiirrnn'rr Conn. 

